JP2604320B2 - Swivel to supply fluid from rotary connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swivel for supplying fluid from a rotary connection in an excavator used for a propulsion method.

[0002]

2. Description of the Related Art Conventionally, there is an air swivel as a device for feeding compressed air or the like to a multi-drill through a hollow portion of an auger shaft which is a hollow tubular body which rotates at the time of drilling. However, when drilling, not only can the multi-drill be given a striking force, but also the target installed in the multi-drill can be surveyed in the drilling direction by collimating it with a surveying machine installed outside. Required.

[0003] For this purpose, a configuration is also employed in which the hollow portion of the auger shaft is used as a supply path for supplying compressed air to the multi-drill and as an observation path for collimating a target. However, in such a configuration in which the supply path of the compressed air and the observation path are also used, the air supply of the compressed air must be stopped during the observation. Further, when the air supply is stopped and the internal pressure is reduced, water vapor is generated in the pipe, which causes a problem that the survey cannot be performed immediately.

[0004] On the other hand, there has been developed an apparatus that employs an auger shaft in which an observation path and a supply path are separately formed, and uses the observation path as a pipe dedicated to feeding compressed air. The auger shaft used in this device has a multi-tube structure. For example, a multi-tube auger shaft is constituted by a central tube located at a central portion and an outer tube located around the central tube. . Then, the inner surface of the central tube is used as an observation path, and the space between the central tube and the outer tube is used as a fluid supply path.

[0005]

In the conventional multi-tube structure, a hole is formed in a side surface of the tube in order to supply a fluid to a flow path provided between the center tube and the outer tube. Is supplying fluid. For this purpose, it is necessary to provide a ring-shaped outermost tube outside the rotating double tube in a non-rotating state, and to form a ring-shaped groove on the inner surface thereof. In that case, at the position where the rotating part and the stationary part touch,
It is necessary to open a fluid intake. For this reason, it is important to ensure the airtightness and watertightness of the parts that come into contact during rotation, and the structure becomes complicated. Further, if the structure is such that a fluid is taken in from the hole on the side surface of the tubular body, it is difficult to take in a large amount of fluid, and its use is limited. Alternatively, in order to take in large quantities, many large-diameter holes and long slits are opened. To make a large opening, the member must be made thicker, and it is obvious that opening a long slit increases the length of the tube.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems. In a pipe having a multi-pipe structure, a fluid is not supplied to an observation path for surveying without surrounding the pipe. It is an object of the present invention to provide a swivel capable of supplying a fluid only to the arranged fluid supply path. Another object of the present invention is to provide a swivel that has a simple structure, is less likely to fail, and can take in a large amount of fluid.

[0007]

SUMMARY OF THE INVENTION The present invention attains such an object, and fluid is supplied from a rotary connecting portion composed of an outer connecting pipe and a center connecting pipe connected to a multi-pipe used in a propulsion method. In the swivel to be supplied, the rotary connecting part 1 composed of the center connecting pipe 3 and the outer connecting pipe 4 is rotated by the driving unit,
The central connecting pipe 3 has a protruding portion projecting from an end of the outer connecting pipe 4, an opening for taking in fluid is opened at a tail end face of the outer connecting pipe 4, and a tail end of the central connecting pipe faces outward. A swivel, which is open as an observation hole and supplies a fluid from a rotary connection, is characterized.

The present invention also relates to a swivel for supplying a fluid from a rotary connecting portion composed of an outer connecting pipe and a center connecting pipe connected to a multi-pipe used in the propulsion method, wherein the center connecting pipe has a through-hole. The rotary connection portion is rotated by a driving portion that is housed in the outer connection tube in the axial direction and is connected to the outer periphery of the outer connection tube, and the center connection tube has a protrusion protruding from an end of the outer connection tube. Then, a supply unit for sending a fluid to a space formed between the inner peripheral surface of the outer connecting tube and the outer peripheral surface of the central connecting tube straddles the end of the outer connecting tube and the end of the protrusion. The end of the outer connecting pipe and the end of the protrusion are rotatably disposed with respect to the supply unit, and an observation hole communicating with the through hole of the protrusion is opened in the supply unit. Opening an inlet for sending the fluid to the supply portion in the outer circumferential direction of the protrusion, and taking in the fluid from the inlet. A swivel for supplying a fluid from a rotary connection, which can observe the inside of the drilled hole from the observation hole while sending the fluid to a space formed between the inner peripheral surface of the outer connecting pipe and the outer peripheral face of the central connecting pipe, It is characterized by the following.

Alternatively, according to the present invention, the center connecting pipe has a through hole, is housed in the axial direction in the outer connecting pipe, and rotates the rotary connecting section by a driving section connected to the outer periphery of the outer connecting pipe. The center connecting pipe has a protrusion protruding from an end of the outer connecting pipe, and supplies fluid to a space formed between an inner peripheral surface of the outer connecting pipe and an outer peripheral surface of the center connecting pipe. And an end of the outer connection pipe and an end of the protrusion are disposed so as to straddle the end of the outer connection pipe and the end of the protrusion. Opening an observation hole communicating with the through hole of the projecting portion in the supply portion, opening an inlet for sending the fluid to the supply portion in the outer peripheral direction of the projecting portion, and setting a surveying machine in the observation hole of the supply portion. Is installed, and the fluid is taken in from the inlet, and the fluid is introduced into a space formed between the inner peripheral surface of the outer connecting pipe and the outer peripheral face of the central connecting pipe. It can be observed the internal drilling from the observation hole with a surveying machine while feeding, is characterized in swivel supplying fluid from the rotary connection.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. The air swivel 10 of the earth auger propulsion method of the present invention comprises a rotary connection part 1 and a fluid supply part 2, and is used by being connected to the tail end of a multi-tube auger shaft 20, as shown in FIG. FIG. 1 is an explanatory view showing an air swivel cut by an earth auger propulsion method of the present invention.

<A> Rotary Connection Portion The rotary connection portion 1 is formed by a central connection pipe 3 which is a hollow tubular member and an outer connection pipe 4 located around the center connection pipe 3. A rotating gear 5 is provided on the outer periphery, and is rotatably supported by the gantry 11. Rotating gear 5
Is rotated by the driving device, the rotary connection portion 1 rotates, and the multi-tube auger shaft 20 connected to the rotary connection portion 1 also rotates. Assuming that the connection side of the rotary connection portion 1 connected to the multi-tube auger shaft 20 is a connection side, and the other side is a supply side, the shape of the connection side of the rotary connection portion 1 matches the end shape of the multi-tube auger shaft 20. Form. That is, the multi-tube auger shaft 20 is
1 and the outer tube 22, the central tube 2
The central connecting pipe 3 for inserting the first pipe 1 and the outer connecting pipe 4 for inserting the outer pipe 22 are formed so that the pipe diameters and shapes are similar to each other.

<B> Fluid Supply Unit The fluid supply unit 2 supplies compressed air via the rotary connection unit 1 and has an intake port 7 which is a part of an opening for taking in compressed air. . Supply unit 2 having hollow part
Is in contact with the rotary connecting part 1 so as to close the periphery of the projecting central connecting pipe 3 and not to hinder the rotational movement. The center connecting pipe 3 and the outer connecting pipe 4 are both hollow pipes, and the center connecting pipe 3 is moved toward the supply side, that is, rearward.
The inlet 7 is open at the projecting portion. Therefore, the tail end surface of the outer connection pipe 4 is open toward the intake port 7 and is in an open state as an opening for taking in fluid. Thus, the outer connecting pipe 4
The fluid is supplied to the inside of the outer connecting pipe 4 from the periphery of the central connecting pipe 3 projecting more rearward, so that the fluid is supplied to the inside of the pipe 4 directly from the open surface of the tail end of the outer connecting pipe 4. Will be.

<C> Observation path The center connecting pipe 3 protruding backward is located in the hollow portion of the supply unit 2, and the tip end of the center connecting pipe 3 is located in the observation hole 6 which is the opening of the supply unit 2. Will be. Therefore, the tail end of the center connecting pipe 3 is opened rearward, and the observation hole 6 is penetrated. The observation hole 6 provided in the supply unit 2
A surveying machine is installed during surveying and used to collimate a target.

[0014]

Next, the operation of the air swivel of the earth auger propulsion method of the present invention will be described. <A> Application of Rotational Force The air swivel of the earth auger propulsion method is connected to the tail end of the multi-tube auger shaft 20 having the multi drill at the tip. The connection is made by combining the connection side of the rotary connection part 1 and the tail end of the multi-tube auger shaft 20. The rotational force given to the rotary gear 5 is
To rotate. Then, the multi-tube auger shaft 20 connected and extended integrally therewith also rotates, and the multi-drill located at the tip portion of the multi-tube auger shaft 20 also rotates.

<B> Supply of fluid It is necessary to constantly supply compressed air to the multi-drill.
For this purpose, the compressed air introduced from the inlet 7 of the supply unit 2 is first supplied directly to the inside of the outer connecting pipe 4 from the open end face of the outer connecting pipe 4. In this way, after entering the space formed between the center connection pipe 3 and the outer connection pipe 4 without entering the center connection pipe 3, the air flows through the supply path A of the connected multi-pipe auger shaft 20. And it is being sent to the multi-drill. Note that other devices may use pressurized water instead of compressed air.

<C> Surveying In order to measure the drilling direction, an observation path B is formed separately from the supply path A. Therefore, without stopping the supply of fluid such as compressed air, a surveying machine can be installed in the observation hole 6 to perform surveying. In other words, the ground at the tip can be kept in a compressed state even during surveying, so that the stability of the ground can be measured and spring water can be suppressed. In addition, since there is no problem such as the stop of air pressure or the generation of water vapor in the inside and the survey can be always performed, the survey in the drilling direction can be accurately performed.

[0017]

According to the present invention, the following effects can be obtained. <A> The center connection pipe and the outer connection pipe of the rotary connection part were connected to the multi-tube auger shaft, and the center connection pipe was formed so as to protrude from the outer connection pipe on the supply side. In the supply unit, an observation hole is provided at the tip of the protruding center connecting pipe, compressed air is taken in from the other provided inlet, and sent to a space formed between the outer part of the center pipe and the outer connecting pipe. I care. Therefore, compressed air can be supplied only to the supply path of the multi-tube auger shaft, and the inner tube can be used for surveying.

<B> When supplying the compressed air to the double pipe, the compressed air is supplied from the open end face of the outer connection pipe. Therefore, as compared with the conventional structure in which a hole is formed in the side surface of the tubular body and fluid is supplied through the annular body surrounding the hole, the outer annular body is unnecessary. Therefore, the size of the entire body can be reduced, which is extremely effective particularly in the case of underground construction in which work must be performed within a narrow range.

<C> The fluid is supplied from the tail end of the rotating tube. For that purpose, open a hole on the side of the tube,
Unlike the conventional structure for supplying the fluid through the annular body surrounding the hole, it is not necessary to provide a fluid intake at a position where the rotating part and the stationary part come into contact with each other. Therefore, the water-tight and air-tight structure of the swivel, which is the most important function, becomes extremely simple, the manufacturing cost is low, and a failure hardly occurs.

<D> Since the fluid is taken in directly from the open face of the tail end of the double pipe, a large amount of fluid can be sent to the tip of the pipe. Therefore, unlike the conventional structure in which a hole is opened in the side surface of the tube and the fluid is supplied through the annular body surrounding the hole, the amount of fluid intake does not depend on the area of the hole in the side surface. A hole is opened on the side of the rotating tube body as in the past, and fluid is taken in from this hole.In order to increase the amount of intake, increase the number of holes or increase the area of the hole Or need to open a long slit. In this case, it is naturally necessary to increase the thickness of the member or to lengthen the length of the tube due to the long slit, resulting in an extremely uneconomical structure.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an embodiment of an air swivel of an earth auger propulsion method according to the present invention.

FIG. 2 is a diagram illustrating a connection relationship between a multi-tube auger shaft and an air swivel.

FIG. 3 is a schematic view of a multi-tube auger shaft.

FIG. 4 is a sectional view taken along line IV-IV of the multi-tube auger shaft.

FIG. 5 is a sectional view taken along line VV of the multi-tube auger shaft.

FIG. 6 is a VI-VI sectional view of the multi-tube auger shaft.

Claims (3)

(57) [Claims] 1. A swivel for supplying a fluid from a rotary connecting part comprising an outer connecting pipe and a central connecting pipe connected to a multi-pipe used in a propulsion method, wherein a rotary connecting part comprising the central connecting pipe and the outer connecting pipe is driven by a driving unit. The central connecting pipe has a protrusion protruding from the rear end of the outer connecting pipe, an opening for taking in a fluid is opened at the tail end face of the outer connecting pipe, and the tail end of the central connecting pipe is external. A swivel that supplies fluid from a rotary connection, opened as an observation hole toward 2. A swivel for supplying a fluid from a rotary connection part comprising an outer connection pipe and a center connection pipe connected to a multi-pipe used in a propulsion method, wherein the center connection pipe has a through hole, and the inner connection pipe has a through hole. The rotary connecting part is rotated by a driving part connected to the outer periphery of the outer connecting pipe, and the center connecting pipe is opened from a tail end face of the outer connecting pipe. An end of the outer connection pipe and the supply section for supplying a fluid to a space formed between an inner peripheral surface of the outer connection pipe and an outer peripheral surface of the central connection pipe; The end of the outer connection pipe and the end of the protruding portion are rotatably disposed with respect to the supply portion, and an observation hole communicating with the through hole of the protruding portion is provided. An inlet for sending the fluid to the supply part in an outer peripheral direction of the protrusion, and Incorporating outer in a space formed between the inner periphery and the outer periphery of said central connecting tube of the outer connection pipe
A swivel for supplying a fluid from a rotary connection, wherein the inside of the drilled hole can be observed from the observation hole while sending the fluid from the opening of the connection pipe . 3. A swivel for supplying a fluid from a rotary connection part comprising an outer connection pipe and a center connection pipe connected to a multi-pipe used in the propulsion method, wherein the center connection pipe has a through hole, and the inner connection pipe has a through hole. The rotary connecting part is rotated by a driving part connected to the outer periphery of the outer connecting pipe, and the center connecting pipe is opened from a tail end face of the outer connecting pipe. An end of the outer connection pipe and the supply section for supplying a fluid to a space formed between an inner peripheral surface of the outer connection pipe and an outer peripheral surface of the central connection pipe; The end of the outer connection pipe and the end of the protruding portion are rotatably disposed with respect to the supply portion, and an observation hole communicating with the through hole of the protruding portion is provided. An inlet for sending the fluid to the supply section in an outer peripheral direction of the projecting section, and an observation hole of the supply section; Installation surveying machine, outer in a space formed between an outer peripheral surface of the inner peripheral surface of the outer connecting pipe incorporates fluid from said mounting inlet and said central connecting pipe
A swivel for supplying a fluid from a rotary connection part, wherein the inside of the borehole can be observed from the observation hole using the surveying machine while sending the fluid from the opening part of the connection pipe .